Sprinkler base



FIG. 1 is a rear left perspective view of the present new design for asprinkler base configured to include an exemplary sprinkler head whichis illustrated in dashed lines and forms no part of the claimed design;

FIG. 2 is a rear left perspective view of the present new design for asprinkler base;

FIG. 3 is a top plan view thereof;

FIG. 4 is a right elevational view thereof, the left elevational viewbeing a mirror image thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a front elevational view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines showing various features of a sprinkler base are forillustrative purposes only and form no part of the claimed design.

The ornamental design for a sprinkler base, as shown and described.